Find a formula that works for you. There are a lot of good formulas out
there but make sure you get one formulated for endurance horses, not
race horses, not cows, etc.
I have become a non fan of the pre mixed paste since I found some of
mine went bad, i.e. even with all the salt it had mold growing in it. It
is handy but it does have a shelf life.
There is absolutely nothing wrong with the tried and ture formula 2
parts salt, 2 parts lite salt and 1 part dolomite.
Truman
Diane Conklin wrote:

The more I read about electrolytes the more confused I get. It sounds
like Endura Max is one of the best to use but....I'm only doing LD's
this year and I'm wondering if my mare even needs that since I'm not
trying to be speedy, just complete. The chance of ulcers sounds like a
big risk. I've used a little of the Farnum apple flavored electrolyte
and I've used a little of the simple recipe in a book on Endurance
(the author escapes me right now).
My mare is on 20acre pasture and gets John Lyons performance everyday.
She is a good drinker and eater at rides.
Any advice would be appreciated.
Diane & Dancer